Process of generating steam from hot slag, &amp;c.



No. 7!],333. Patented Oct. l4, I902.

G. MITCHELL & L. D. COPELAND.

PROCESS OF GENERATING STEAM FROM HOT SLAG, 6w.-

(Application filed June 14, 1902.) kNn Model.) 4 Sheets-Sheet l.

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No. 7H,333. Patented Oct. l4, I902.

G. MITCHELL & L. D. COPELAND. PROCESS OF GENERATING STEAM FROM HOT SLAG,&c.4

(Application filed June 14, 1902.)

4 Sheets-Sheet 2.

{No Model.)

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No. 7I|,333. Patented Oct. l4, I902. G. MITCHELL & L. D. COPELAND.PROCESS OF GENERATING STEAM FROM HOT SLAG, 8w.

(Application filed June 14, 1902.)

4 Sheets-Sheet 3.

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N0 7||,333. Patented Oct. l4, I902. G. MITCHELL & L. D. CUPELAND PROCESSOF GENERATING STEAM FROM HOT SLAG, 8w.

(Application filed June 14, 1902.)

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UNITED. STATES PATENT OFFICE.

GEORGE MITCHELL, OF NAOO, ARIZONA TERRITORY, AND LUOIUS D. COPE- LAND,OF LOS ANGELES, CALIFORNIA.

PROCESS OF GENERATING STEAM FROM HOT SLAG, 800.

SPECIFICATION forming part of Letters Patent No. 71 1,333, dated October14, 1902.

Application filed June 14, 1902. Serial No. 111,742. No model.)

To all whom it may concern: 2 is a steam-pipe for carrying off steam.

Be it known that we, GEORGE MITCHELL, of The upper end 3 of the casingis provided Naco, in the county of Cochise and Territory with a funnelor hopper 4 for the reception of Arizona, and LUCIUS D. COPELAND, of Losof molten slag and with a slide-valve 5 for 55 5 Angeles, in the countyof Los Angeles and controlling its feed.

Stateof California, haveinvented certain new 6 is a slag-receptacle,preferably cone or and useful Improvements in Processes ofUtilbellshaped, its upperand open end being proizing Hot Slag; and we dohereby declare the vided with a ground-seat 7, which may be following tobe a full, clear, and exact deseated steam-tight against the seat 8 onthe 60 IO scription of the invention, such as will enable upper end orplate 3. A ring 9 encircles the others skilled in the art to which itappertains slagreceptacle and has a limited vertical to make and use thesame. movement between the upper and lower set Our invention relates toan improved procof lugs 10 and 11. The ring is furnished with ess forgenerating steam from hot slag or hot trunnions 12, which are journaledin bearings 65 refuse produced in blast-furnaces or other 13, attachedto the shell or casing. One of metallurgical apparatus. the trunnionsextends through a stuffing-box The object of the invention is to utilizethe 14 and is provided at its outer end with a heat stored in hot slagor other hot refuse handle 15 for turning the trunnions so as toproduced in metallurgical operations to gentilt the ring 9, and with itthe slag-receptacle, 7o erate and maintain a constant supply of todischarge the hot slag into the body of wasteam under pressure for useas motive power ter in the generator and for returning the reor otherpurposes. ceptacle back into its'position for refilling, as A furtherobject is to utilize the heat of hot indicated in Figs. 1 and 2. slag orlike hot refuse to generate and main- 16 is a rock-shaft journaled intrunnions, 75

tain a constant supply of steam under presone end of the shaft extendingthrough a sure and also to granulate the slag, thus stuffing-box 17 andprovided with a handle transformingit into a condition which will en-18. An arm 19, attached to the rock-shaft, able it to be economicallyhandled and used. is adapted to engage the under side of the With theseobjects in view the invention slag-receptacle andlift it and cause itsseat 80 consists in feeding charges of hot slag into '7 to engage theseat Sand form a steam-tight. contact with Water under pressurecontained joint therewith. The spaced lugs 10 and 11 in asteam-generator adapted to be closed permit of this vertical movement.steam-tight while the slag is being fed into The upper end of theslag-receptacle is proand discharged from the generator. vided with agear-wheel 19, which when the 85 To facilitate a clear understanding ofour receptacle is raised is moved intomesh with improved process, itwill be explained in conpinions 20, carried on the lower ends of shaftsnection with different constructions of appa- 21. These shafts extendthrough stuffingratus for carrying it into effect. boxes 22 and arel'urnished with hand-wheels In the accompanying drawings, Figure 1 is\Vhen the slag-receptacle is being raised 90 40 a vertical section ofone form of apparatus. and forced against its seat, it may be rotatedFig. 2 is an enlarged vertical section of the by the means described,and any particles of upper portion of the apparatus on line 2 2 ofmolten slag that may have lodged on the up- .Fig. 1. Fig. 3 is a View,partly in vertical per end of the slag-receptacle or its seat maysection and partly in side elevation, of anbe so ground and reduced thatthe two seats 5 other form of apparatus. Fig. 4 is a view at will insurea tight joint and prevent the esright angles to Fig. 3. Fig. 5 is a planView, cape of steam. A steam-pipe 24, provided and Figs. (3 and 7 aredetached views, of the with a valve 25, leads from the generatorintovalve. the space 26 below the feed or slide valve 5 1 is the shell orcasing of a steam-generator, and serves to admit steam into the space100 adapted to hold any desired quantity of waabove the slag-receptacleafter it has been ter to be converted into steam. filled to equalize thepressure thereon and permit it to. be readily lowered from its seat andits contents discharged. The valve 25 A cross-bar 27 is arranged belowthe slag-receptacle and serves to break up and divide the charge of hotslag before it reaches the body of water in the generator, and therebyprevent any possibility of an explosion of the slag. A safety-valve 28is attached to the top of the generator-casing.

The lower end of the generator shell or casing is funnel-shaped and isconnected by a conduit 29 with a receiving vessel or receptacle 30, avalve 31, located in the conduit 29, serving to control the discharge ofcooled granulated slag from the generator-casing into the lower chamberor receptacle 30. The

lower end of this receptacle is provided with a hinged cover 32, whichis adapted to be closed steam-tight and is provided with a sieve orperforated plate 33, on which the granulated slag falls and issupported. A pipe 34 is provided for drawing off the water from belowthe perforated plate 33.

Having described the construction of one suitable construction ofapparatus, we will now briefly describe our improved process. Thegenerator casing or shell is partly filled with water, the supply beingmaintained by any suitable feed-water pump. At the outset all the valvesare closed. A charge of hot slag is fed into the funnel or hopper 4. The

valve 5 is thenopened,and the charge is fed by its gravity into theslag-receptacle 6, and the valve 5 is then closed. Valve is then openedand steam is admitted into the space i into the body of water, it beingdivided and.

brokenin its descent by the cross-bar 27.

The instant the hot slag comes into contact with the body of water inthe generator the slag is granulated, which allows the water to comeinto direct and intimate contact with the surface of each particle ofhot slag, with the result that the heat stored therein is rapidlyabsorbed by the water, which in turn is quickly transformed into steam.After the slag-receptacle has been tilted and its contents dumped it isturned back to its upright position and raised against its seat, and theoperation is repeated as often as may be necessary to maintain aconstant supply of steam of any desired volume and pressure. Should theupper end of the slag-receptacle fail to close steam-tight against itsseat because of the lodgment of any particles of molten slag on eitherportion of the seat or for other reasons, the slag-receptacle is rotatedand any such obstructions or irregularities of wear are removed orcompensated for. The granulated slag that accumulates in the bottom ofthe generator is discharged therefrom from time to time into the lowerchamber or receptacle 30 by opening the valve 31.-

The slag-receptacle is then.

The

granulated slag falls on the perforated plate 33, and from time to timeis removed by opening the cover or valve 32, the valve 31 being closed.When the slag is discharged from the generator into the lower chamber,the hot water that is discharged with the slag may be conveyed throughpipe 34 to a feed-water heater or tank and be either pumped back intothe generator or may be used for other purposes.

By our process the molten slag is fed by its gravity into the generator,where it is granulated and quickly parts with the heat stored therein,and the granulated slag is then discharged by its gravity and is in acondition to be easily handled for any of the many uses for which it isadapted.

The process can be practiced in widely-different forms and conditions ofapparatus. Instead of employing an apparatus of the constructionhereinbefore described an apparatus of the construction illustrated inFigs. 3 to 7, inclusive, may be employed. In this form of apparatus theslag-receptacle 35 is stationary, its lower end projecting into thegenerator-casing and provided with an oscillating valve 36, which isoperated by a handle 37. Springs 58 are interposed between the valve androck-shaft and serve to hold the valve against its seat and compensatefor any wear. A hopper or funnel 39 communicates with the upper end ofthe slag-receptacle, and a rotary valve 40 controls the discharge ofmolten slag for the hopper into the slag-receptacle. 41 is a drift-hooksecured at one end to a rock-shaft 42, which is provided with a rigidarm 43. A second rockshaft 44 extends through the casing and has ahandle 45 attached to its outer end. Rockshaft 44 has a rigid arm 46,which is connected to arm 43 by means of a link 47. By actuating thehandle 45 the drift bar or hook may be moved into and out of the lowerend of the. slag-receptacle when the valve 36 is open and discharge anyslag that may have become clogged thereon. 48 represents removablelining-sections, which serve to protect the generator-casing from beingquickly worn away by the slag as it is fed downwardly through thegenerator. A discharge-chamber 49 is connected to the bottom of thegenerator, a rotary valve 50 being provided for controlling thedischarge of slag from the generator into such chamber and another valve51 controls the discharge of slag from the chamber. The steam pipe 52may supply steam to any suitable boiler or receptacle and is providedwith a check-valve 53 to prevent the return of steam to the generator inthe event the pressure in the gencratorshould fall below the pressure insuch boiler or receptacle.

As it is evident that our process may be practiced in Widely differentforms and constructions of apparatus we would have it -understood thatour invention is in no wise restricted to the employment of anyparticular form or construction of apparatus.

Having fully described our invention, what we claim as new, and desireto secure by Letters Patent, is-- 1. The process of generatinga constantsupply of steam under pressure from the heat contained in hot slag,consisting in feeding, charges of hot slag by its gravity into contactwith water confined under pressure in a steamgenerator adapted to beclosed steam-tight while the slag is being fed into the water anddischarged therefrom, substantially as set forth.

2. The process of generatingaconstant supply of steam under pressurefrom the heat contained in hot slag, consisting in intermittinglyfeeding charges of hot slag by its gravity into a body of water confinedunder pressure in a steam-generator adapted to be closed steam-tightwhile charges of slag are being fed into the body of Water anddischarged therefrom, substantially as set forth.

3. Theprocessofgeneratingaconstantsupply of steam under pressure fromthe heat contained in hot slag, and granulating the slag, consisting inintermittingly feeding charges of hot slag by its gravity into waterconfined under pressure in a'steam-generator adapted to be closedsteam-tight while charges of slag are being fedinto the water anddischarged therefrom and in intermittingly discharging granulated slagfrom such confined body'of water, substantially as set forth.

4. The process of generatingaconstant supply of steam under pressurefrom the heat contained in hot slag, consisting in intermittinglyfeeding hot slag by its gravity into a body of water confined underpressure in a steam-generator adapted to be closed steamtight whilecharges of slag are being fed into the water and discharged therefrom,and intermittinglydischarging granulated slag by its gravity from suchconfined body of water, substantially as set forth.v

In testimony whereof we have signed this specification in the presenceof two subscrib- 45 ing witnesses.

GEORGE MITCHELL. LUOIUS D. COPELAND.

Witnesses:

S. G. NOTTINGHAM, A. W. BRIGHT.

